Cutting machine



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Moro( ZZ Patented May 24, 1938 .um'rED s'rATl-:s/

PATENT OFFICE Am Allgllt 3, 1936, Serial N0. 94.586

Claim The present invention relates to improvements in cutting machines generally and more particularly to a machine designed primarily for the cutting of ilat sheets or plates of glass or the like.

While the invention is of coursenot limited to the cutting of any particular shape or size of glass sheet, it is especially applicable to the cutting of so-called half windshields for automobiles. It has been customary in the past for the windshields of automobiles to consist of a single sheet or plate of glass extending the entire width of the machine. More recently, however. the practice has been to make the windshields of two sheets or plates of glass separated at their inner adjacent edges by a substantially vertical post or the like arranged at the center of the machine. Each sheet or plate of glass is referred to as a half windshield and two similar half windshields are used to make the complete windshield.

Prior to this invention, it was the usual practice to cut the half windshields by hand, this being done by taking a sheet of glass oi the approximate size of the half windshield and employing a pattern plate or template member of the desired shape and size which was laid upon the sheet to be cut, after which a cutting or scoring tool was drawn by the operator over and in contact with the glass, being held in engagement with the edge of the template or pattern and guided thereby. Aiter the glass was scored, the template or pattern was removed and the glass broken along the score line.

The hand method of cutting above described is, however, open to several objections among which may be mentioned the fact that the template must usually be held upon the glass with one hand while the operator draws the scoring tool over the glass with the other hand. When so manipulated, the template sometimes slips or becomes misplaced and the work is spoiled. Also, a uniform cutting pressure on the cutting tool is difficult to maintain throughout its path of travel when moved by hand. with the result 45 that the score is deeperl at some places than at others, so that in separating the waste from the cut out section, a rough break occurs leaving the edges of the cut out section more or less ragged. Consequently, the hand cutting of glass sheets requires highly skilled workmen.

An important object of the present invention is the provision of a cutting machine which will effectively overcome all of those objections referred to above as being present in hand cutting and by means of which it is possible to cut out from glass sheets or plates half windshields of the desired contour rapidly, accurately, and economically.

Another important object of the invention is the provision of a cutting machine which will cut out in a single operation the two half windshields going to make up a complete windshield, the machine being entirely automatic in its operation, thereby greatly increasing the speed of production of the machine as well as reducing to a minimum the eort and attention required on the part of the operator.

Other objects and advantages of the invention will become more apparent during the course of the following description when taken in oonnection with the accompanying drawings.

In the drawings wherein like numerals are employed to designate like parts throughout the same.

Fig. 1 is a plan view of a cutting machine constructed in accordance with the invention;

Fig. 2 is a longitudinal vertical sectional view taken substantially on line 2 2 of Fig. 1;

Fig. 3 is a transverse vertical sectional view taken substantially on line 3 3 of Fig. 2;

Fig. 4 is a transverse vertical sectional view taken substantially on line 4 4 of Fig. 2;

Fig. 5 is a vertical sectional view through the cutting mechanism taken substantially on line 5 5 of Fig. 1;

Fig. 6 is a vertical sectional view through the cutting mechanism taken substantially on line 6 6 of Fig. 5;

Fig. 7 is a horizontal sectional view through the template cutting unit taken substantially on line 1 1 of Fig. 6;

Fig. 8 is a longitudinal sectional view of the approach roller conveyor taken substantially on line 8 8 of Fig. l;

Fig. 9 is a longitudinal sectional view oi' the take-off roller conveyor taken substantially on line 9 9 of Fig. l;

Fig. 10 is a plan view of the means for bringing the template cutting unit to a stop at the completion of its cutting cycle;

Fig. 1l is a vertical sectional view through the template cutting unit stop means, taken substantially on line Il ll of Fig. 1;

Fig. 12 is a detail sectional view taken substantially on line I2 l2 of Fig. 2, showing the means for limiting the downward movement of the cutting table;

Fig. 13 is a side elevation of the means positioned at the forward end of the cutting table for 'limiting the forward movement of the sheet;

verse out 29 Fig. 14 is a detail sectional view, taken substantially on line |4|4 of Fig. 3, oi the drive for the cross cutting unit;

Fig. 15 is a side view of the rotatable drum which controls the operation o! the various parts of the machine;

Fig. 16 is a vertical sectional view taken substantially on line |6|6 of Fig. 15 showing the means for controlling the rotation of the drum;

Fig. 17 is an electrical Wiring diagram o! the means for controlling the rotation of the drum; and

Fig. 18 is an electrical wiring diagram illustrating the operation of the various parts of the machine.

General statement Brieily, the cutting machine of this invention comprises a table supporting structure 20 having associated therewith a fiat, horizontal top 2| for supporting the glass sheet 22 during the cutting thereof. Arranged above the table top 2| in vertically spaced relation thereto is a horizontal track template 23 having the same configuration as the form or section to be cut from the glass sheet. Mounted upon the track template 23 and guided thereby is a power driven cutting unit 24 (hereinafter termed the template cutting unit) and which includes a rotatable steel cutting wheel 25 (Figs. 5 and 6), said unit being adapted to travel around the template 23 to score the glass sheet 22 along the score line indicated at 2S (Fig. l) in the form o1" a complete windshield. Mounted beneath and carried by the table top 2|, intermediate the ends thereof, is a second power driven cutting unit 21 (hereinafter termed the cross cutting unit) and which includes a rotatable steel cutting wheel 28 (Figs. 5 and 6), said unit being movable in a straight path transversely of the table to cut the complete windshield in half along the line 2s (Fig. l) to form two similar half windshields.

The cutting units 24 and 21 are operated in timed relation to each other so that the transis made simultaneously with and during the cutting of the sheet along the line 26. The cutting tool 25 of the template cutting unit 24 is arranged to travel through a closed path while the cutting tool 28 of the cross cutting unit 21 is movable along a straight path and intersects the closed path of the cutting tool 25 at two opposed points.

in accordance with the invention, means is provided for automatically raising the table top 2| and glass sheet supported thereon just prior to the cutting operation and for maintaining them in elevated position during the said cutting operation, upon the completion of which the said table and sheet are automatically lowered. The machine further embodies an approach roller conveyor 30 (Figs. l and 8) operable automatically to feed the glass sheets onto the cutting table and a take-off roller conveyor 3| (Figs. 1 and 9) for receiving the sheets from the table subsequent to cutting. Means is also provided for accurately positioning the glass sheets upon the table and for preventing accidental displacement thereof during cutting as Well as means for first slowing up the travel of the template cutting unit and then bringing the same to a stop at the completion of its cutting cycle. A common electrical control means is also incorporated in the machine for automatically controlling the operation of the various parts thereof. In addition to the above, the machine embodies various other novel features of construction, arrangement and operation which will be more fully hereinafter described.

Cutting table construction As stated above, the cutting table comprises a supportingstructure 20 and a vertically movable top 2| carried thereby. The supporting structure 20 is illustrated in Figs. 1 to 4 of the drawings and includes a substantially rectangular framework provided at each end with a pair of spaced vertical legs 32 and 33, connected together adjacent their upper ends by a horizontal cross member 34 and adjacent their lower ends by a similar cross member 35. The legs 32 and 33 project upwardly beyond the cross members 34 and supported upon the upper ends thereof are the two longitudinally extending channel beams 36 and 31 positioned at opposite sides oi the table. Arranged transversely of and secured to the channel beams 36 and 31 at the opposite ends of the table are the connecting channel members 38 and 39 and rotatably carried by the said channel members and extending longitudinally of the table are the spaced parallel shafts 40 and 4|.

Fixed to the shaft 40 adjacent its opposite ends are the two bell-crank levers 42 and 43, each comprising a substantially vertical depending leg 44 and a substantially horizontal shorter leg 45. Keyed to the shaft 4|, opposite the bell-crank levers 42 and 43 on shaft 4|), are similar bell-crank levers 4B each comprising a substantially vertical depending leg 41 and a substantially horizontal shorter leg 48.

The table top 2| is substantially rectangular in plan and has secured to the underside thereof, adjacent its opposite ends, brackets 49 and 5U to which the substantially horizontal legs 45 of bellcrank levers 42 and 43 are pivoted as at 5|, while the substantially horizontal legs 48 of bell-crank levers 46 are pivoted as at 52 to similar brackets 53 also carried upon the underside of the table top.

The depending legs 44 of bell-crank levers 42 and 43 are connected together at their lower ends by a horizontal rod 54 and a similar rod 55 connects the lower ends of the depending legs 41 of bell-crank levers 46. The parallel rods 54 and 55 are in turn connected together at their opposite ends by horizontal links 55 and 51 so that all ol the bell-crank levers will operate in unison. Fastened to the rod 55 at each end thereof is one end of a tension spring 58 fastened at its opposite end to a horizontal plate 59 secured to the supporting framework. The springs 58 tend to normally urge the bell-crank levers in a counterclockwise direction to raise the table top 2| but they are not of suicient strength to alone effect such raising. The purpose of these springs will be more clearly hereinafter described.

The means for raising the table top 2| comprises a pair of solenoids 60 and 6|, each being carried by a frame B2 suspended from a longitudinally extending horizontal plate 63 by hangers 64. The plate 63 is carried at its opposite ends by hangers B5 and G6 secured to the horizontal angle beams 61 and 68 respectively extending transversely of the table and secured to the longitudinally extending channel beams 36 and 31. Keyed to the shaft 4| are two substantially horizontal lever arms 69 and 10 to the outer ends of which are pivoted, as at 1| and 12, the vertical depending links 13 and 14 respectively pivotally connected at their lower ends, as at 15 and 16, to

theverticaipiungerslland'llofthesolenoidsll and 9| rpectively.

Whenitisdesiredtoraisethetabletop2l,the solenoidsandllareenergiaedtodrawthe plunger: 1l and I9 thereof downwardly, thereby rockingtheshsit 4| inacounter-clockwisedirectionandcausingaliofthebell-crankleversto operatein unison. Theraisingofthetabietop by the solenoids will be assisted by the action of the springs 99 which, as pointed out above. are alwaystendingtoraisethetabie butarenotof suiiicient strength to actually eect such raising. However, they do materially assist in the table raising upon energization of the solenoids. Upon de-energization of the soienoids 99 and 9|, the weight of the table will cause it to be lowered against the action of the springs 59. For the purpose of limiting the downward movement of the table, there is provided a pair of horizontal straps 19 and 99 (Figs. 2 and l2) arranged at opposite ends of the rod 55 and each having a slot 9| therein through which the said rod Each strap is carried by an angle bracket 92 secured to the plate 59, being secured to the said bracket by a bolt 99 passing through a slot 94 in said strap. Upon raising of the table top, the'rod 55 moves forwardly in the slots 9| of the straps whereas when the table top is lowered, the

rod 55 engaging the rear end walls of the slots serves to limit the downward movement thereof. Due to the provision of the slots 94 in the straps 19 and 99, the said straps can be adjusted horizontally to regulate the downward movement of the table top.

Extending longitudinally of the supporting framework 29 and carried upon the transverse angle beams 61 and 99 are the angle members 95 and 99 to which are secured a plurality of spaced pairs of vertical bearing straps 91 and 99 which rotatably carry at their upper ends rollers 99, 99, 9|, 92, 99 and 94 which operate within transverse openings 95 to |99 respectively formed in the top of the table. 'I'he rollers 99, 99 and 92 are mounted to freely rotate, while the rollers 9|,

, 99 and 94 are positively driven. The drive for the rollers 9| and 99 includes a transverse shaft |9| (Fig. 3) rotatable in spaced bearings |92 and |99 carried respectively by the angle member 95 and a parallel angie member |94. Keyed to one end of the shaft |9| is a sprocket wheel |95 about which is trained a sprocket chain |99 also passing around a sprocket wheel |91 keyed to the roller 9|. A second sprocket wheel |99 is also xed to shaft |9| and has trained thereabout a sprocket chain |99 also passing around a sprocket wheel ||9 carried by roller 99.

'I'he shaft |9| is driven from a drive shaft through the intermeshing spiral gears ||2 and ||9, said shaft extending longitudinally of the cutting table and being rotatably supported at each end in a bearing ||4 (Fig. 9) carried by an angle iron I5. 'I'he shaft I may be driven from a suitable source of power through a sprocket and chain drive ||9 or in any other preferred manner. From the above, it will be seen that upon rotation of the shaft the shaft |9| will be driven through the intermeshing gears ||2 and ||9 to effect rotation of the rollers 9| and 99 through the sprocket chains |95 and |99. The means for driving the roller 94 includes a transverse shaft ||1 journaled in spaced bearings ||9 carried by the angle members 95 and 99 and driven from the drive shaft through the intermeshing spiral gears ||9 and |29 (Fig. 9). Keyed to the shaft ||1 is a sprocket wheel |2| and trained aboutsaidwheeiisasprocketchain |22 alsopassingaroundasprocketwheel |29 carried byroller94. Therollers 9|,99and94arepref erably continuously driven at all times.

Duringthefeedingoftheglasssheetutobe cut onto the cutting table from the approach runway 99. the tabletop 2| is in lowered position. at which time the rollers 99 to 94 project upwardly slightly beyond the upper surface of the said table top, as shown in Pig. 2, to receive the glass sheet thereon. The sheet is carried forwardly by the driven rollers 9|, 99 and 94 to the desired position on the table where it is brought to a stop. The table top 2| is then raised into cutting position whereupon the glass sheet will be transferred from the rollers to the stationary top of the table. The cutting of the sheet is then effected after which the table top is lowered to again bring the glass sheet to rest on the rollers 99 to 94 whereupon the rollers 9|, 99 and 94 will deliver the sheet from the table onto the take-oil conveyor 9|, during which time another sheet is being fed onto the rollers from the approach conveyor 99.

Approach and take-011 conveyors 'I'he approach conveyor 39, which is arranged at the forward end of the machine and which is adapted to feed the glass sheets to be cut onto the cutting table comprises a plurality of horizontally aligned rolls |24, while the take-off conveyor 9|, which is arranged at the opposite end of the machine, and which is adapted to receive the cut sheets from the table comprises a plurality of horizontally aligned rolls |25. The rolls |24 and |25 are in horizontal alignment with one`another and also with the rollers 99 to 94 inclusive.

The approach runway 99 is best illustrated in Figs. 1 and 8 and the rolls |24 thereof are carried by shafts |29 journaled at their opposite ends in bearings |21 and |29 mounted on the longitudinally extending channel beams |29 and |99 which align with and constitute, in e'ect, extensions of the channel beams 99 and 91 respectively at opposite sides of the cutting table. The take-oil runway 3| is best illustrated in Figs. 1 and 9 and the rolls |25 thereof are carried by shafts |9| journaled at opposite ends in bearings |92 and |99 mounted on the longitudinally extending channel beams |94 and |95 which also align with and constitute, in effect, extensions of the channel beams 99 and 91.

The rolls |25 of the take-oil' conveyor are adapted to be continuously driven at all times from the drive shaft and to this end there is carried by the channel beam |95 a pair of horizontally spaced bearings |95 and |31 in which is journaled a short shaft |39 having keyed at its opposite ends spiral gears |99 and |49 meshing with spiral gears |4| and |42 respectively ilxed to the shafts |3| of two adjacent rolls |25. Fixed to the shaft is a sprocket wheel |43 about which is trained a sprocket chain |44 also trained about a sprocket wheel |45 keyed to shaft |39:-v

Each of the roll shafts |3| carries a sprocket wheel |45 and running over these sprockets is a sprocket chain |41 so that upon rotation of the shaft |99, all of the rolls |25 will be driven in unison. f

'I'he rolls |24 of the approach conveyor 39 are intermittently driven and are caused to rotate only during the time the glass sheets are being fed onto the cutting table. The drive for the rolls |24 is substantially the same as that for the rolls |25 of the take-off conveyor 3|, with the exception that means is provided for automatically starting and stopping the rotation of the rolls |24 at predetermined intervals. The drive for these rolls comprises a horizontal platform |48 supported by posts |49 and having mounted thereon a vertical frame |50 and a bearing bracket |5|. The frame |50 consists of a pair of spaced vertical side members |52 and |53 connected at their upper ends by a cross rod |54. The numeral |55 designates a horizontal drive shaft journaled at one end in the bearing bracket |5| and at its opposite end in the side member |53 of frame |50.

Mounted upon the shaft |55 is a friction clutch, designated in its entirety by the numeral |56 and comprising a sleeve |51 keyed to the shaft |55 and a second sleeve |58 loose on said shaft. rFhe sleeves |51 and |58 carry at their inner adjacent ends discs |59 and |60 respectively which friction ally engage one another. The sleeve |51 is continuously driven at all times from a suitable source of power through a chain and sprocket drive or the like |6 while the rolls |24 are intermittently driven from the sleeve |58 through a sprocket chain |62 trained about a sprocket Wheel keyed to the said sleeve and also about a. sprocket wheel |63 fixed to a short horizontal shaft |64 journaled in spaced bearings |65 and |66 secured to the channel beam |30. Keyed to the opposite ends of the shaft |64 are spiral gears |61 and |68 which mesh with spiral gears |69 and |10 respectively fixed to the shafts |26 of two adjacent rolls |24. Each of the roll shafts |26 has keyed thereto a sprocket |1| and trained about these sprockets is a sprocket chain i12 so that upon rotation of the shaft |64., all of the rolls |24 will be driven in unison.

During the operation of the cutting machine, the sleeve |58 is periodically moved along shaft |55 to cause the disc |60 carried thereby to alter nately engage and disengagc the disc |59 on sleeve |51. When the two discs are in frictional engagement with one another, the sleeve |58 will be driven from the sleeve |51 to effect rotation of the rolls |24. On the other hand, when the discs |59 and |60 are disengaged, rotation of the sleeve |58 will stop, so that the drive to the rolls will be broken.

The sliding of the sleeve |58 along shaft |55 to disengage the discs |59 and |60 is controlled by a solenoid |13 carried in a frame i1|| suspended from the platform |48 by hangers |15. The numerals |16 and |11 designate apair of toggle links which are pivotally connected together at their inner ends as at |18 to a depending link |19 pivoted at its lower end at tothe vertically movable plunger |8| of the solenoid |13. The toggie link |16 is pivoted at its outer end as at |82 to the side member |52 of frame |50, while the toggle link |11 is pivotally connected at its outer end as at |83 to a collar |84 loosely mounted in a circumferential groove |83 formed in the sleeve |58. The toggle links |1'6 and |11 are normally drawn upwardly by a tension spring |85 and this spring serves to maintain the toggle links in the position indicated in full lines in Fig. 8, at which time the discs |59 and |60 are in engagement with one another so that the rolls |24 are rotating. This condition will be maintained until the solenoid |13 is energized whereupon the down- Ward movement of plunger |8| will cause the toggie links to assume the position indicated by the broken lines and when this occurs the sleeve |58 will be drawn outwardly along shaft |55 to disengage disc |68 from disc |59, thereby breaking the drive to the rolls. As soon as the solenoid is again de-energized, the action of the spring |85 will automatically cause the discs |59 and |60 to be engaged to drive the rolls |24.

Template The template 23 for supporting and guiding the cutting unit 24 preferably comprises a relatively narrow continuous track of the desired shape and size supported horizontally above the cutting table by a plurality of substantially horizontal supporting arms |86 provided at their outer ends with slots |81 (Fig. l) through which pass the bolts or other fastening elements |88. These fastening elements serve to secure the arms |86 to the metal strips |89 and |90 extending longitudinally at opposite sides of the table and carried by the channel beams 36 and 31 respectively. The strips |89 and |90 are secured to said channel beams by bolts |9| and .are held spaced thereabove by collars |92 (Fig. 13) through which the said bolts pass. The template 23 is secured to the inner ends of the arms |86 by bolts or the like |93 and by reason of the slots |81 in arms |86, 'the said arms can be adjusted to accommodate templates of different shapes and sizes.

Template cutting unit As shown in Fig. l, the cutting unit 24 is carried at the outer end of a horizontal' supporting arm |94 hinged at its inner end at |95 to a second horizontal arm |96 which is pivoted at |91 to a bracket |98 mounted upon a platform |99 carried by the supporting framework of the machine.

With reference particularly to Figs. 1, 5, 6 and 7, the cutting unit 24 comprises a housing 200 provided with a removable top plate 20| secured in place by screws or the like 202. Fastened to the `top plate 20| by screws 203 is a vertical bushing 294 which is rotatably mounted in a bearing 295 formed at the outer end of the supporting arm 94, said bushing 204 projecting above said bearing and having threaded thereon a nut 206 which serves to secure the cutting unit to the supporting arm.

Formed in the housing 200 is a horizontal rectangular bore 291 closed at one end by a removable cap 208 and being open at its opposite end. f .oosehr received within the bore 201 is an elongated bar 289 projecting through the open end of said bore and provided at its outer end with a head 258. The head 2li] is formed at its lower end with a dove-tailed rib 2|| (Fig. 6) and carried thereby is a horizontal plate 2|2 provided in its upper surface with an undercut groove j 2|3 (Fig. 6) receiving therein the rib 2| The plate 2 i2 is provided at its outer end with a well 2|4 in which is received the cylindical cutter holder 2|6, said holder having a depending reduced portion 2 |1 projecting through an opening 2|8 in the bottom of said well and carrying the rotatable steel cutting wheel 25.

lThe opposite side walls of the well 2|4 are provided with aligned vertical slots 2|9 and carried by the cutter holder 2|6 are horizontal pins 220 which project outwardly through said slots. Pivoted to the end of the plate 2|2 remote from well 2|4, as indicated at 22| in Fig. 5, is a lever 222 bifurcated at its outer end to provide the spaced legs 223 which straddle the well 2|4 and engage the pins 220, said lever acting to urge the cutting wheel 25 downwardly into engagement with the glass sheet.

The head 2|0 is provided with a vertical opening 224 in which is mounted a vertical pressure 'a,11s,1'ro 1 pin 225. said pin projecting downwardly through' an opening 226 in the plate 2|2 and engaging the lever 222. Threaded within the upper end of the opening 224 is a nut 221 while formed upon the pressure pin 225 adjacent the lower end thereof is an annular flange 220. Arranged within the opening 224 and encircling pressure pin 225 are the two concentric compression springs 229 which bear at their upper ends against the nut 221 and at their lower ends against the flange 225, thereby acting to normally urge the pin 225 downwardly to engage the lever 222. With this construction, the cutting wheel 25 will be yieldably maintained in engagement with the glass sheet and the pressure of the cutting wheel upon the glass can be regulated by proper adjustment of the nut 221 to control the compression of the springs 229. The plate 2|2 may be adjusted horizontally relative to head 2|0 to vary the position of the cutting wheel 25 by means of a set screw 230 which passes through a boss 23| on the plate 2|2 and vengages the head 2|0.

Carried by the head 2|0 is a freely rotatable guide roller 232 mounted upon the vertical stub shaft 233 and adapted to engage one vertical side edge of the template 23. Carried by the housing 200 and adapted to engage the opposite vertical side edge of the template are the spaced g'uide rollers 234 and 235, -the roller 232 engaging the template at a point intermediate the two rollers 234 and 235. 'I'he roller 234 is also freely rotatable and is mounted upon a screw 236 threaded at its upper end in an opening 231 in the housing 200, said screw being provided at its lower end with a flange 230 for holding the roller in place. 'Ihe roller 235 is positively driven and to this end is fixed to a vertical shaft 239 by a key 240. 'Ihe shaft 239 passes upwardly through a bushing 24| in the housing 200 and is received at its upper end in a bearing 242 set in the top plate 20|. Arranged beneath the bushing 24| is an oil packing ring 243 and carried at the lower end of the shaft 239 is a nut 244 and washer 245 for maintaining the roller 235 in place.

The roller 235 is driven through a train of reducing gears arranged in the housing 200 and including a gear 245 mounted upon shaft 239 and supported upon the upper end of bushing 24|, said gear being driven from a gear 241 mounted upon a stubshaft 249 disposed in substantial vertical alignment with the screw 236 supporting roller 234. The gear 241 is provided with a hub 249 upon which is mounted a third gear 256 and this gear is driven from a gear 25| keyed to a vertical stub shaft 252, said shaft being journaled at its opposite ends in bearings 253 and 254. The shaft 252 is provided with a reduced upper end 253' received within a bore 255 in a bearing 256 arranged within the bushing 204, said bearing being keyed to the reduced upper end of shaft 252 by screws or the like 251. Also received within the bore 255 in bearing 256 is one end of a flexible shaft 250 secured to the said bearing by set screws or the like 259. The flexible shaft 256 is connected at its opposite end with a motor 260 suspended a suitable distance above the cutting table. Upon operation of the motor 260, the exible shaft 256 turning the bearing 256 will effect rotation of gear 25| and this rotary motion will then be transmitted to the guide relier 235 through the gears 250, 241 and 246 respectively. 'I'he positive rotation of the guide roller 235 will ,cause the cutting unit 24 to be driven around the template, 23.

It is of course essential in the operation of the machine that the rotatable steel cutting wheel 25 be always maintained tangent to the line of cut if a satisfactory cut is to be made, and the same is equally true when using a cutting diamond instead of a rotatable steel wheel. 'I'he provision of the guide rollers 232, 234 and 235, together with the fact that the cutting wheel is prevented from rotating about an axis extending perpendicular to the glass sheet, serve to maintain the cutting edge of the wheel tangent to the line of cut as the cutting unit is propelled around the template.

'Ihe guide roller 232 is yieldably maintained in engagement with the template 23 bythe action of a compression spring 26| which is arranged within the bar 209 and which encircles a rod 262 also arranged therein and formed at its inner end with a flange 263. 'I'he rod 262 projects at its outer end through a block 264 carried by the bar 269 and also through the cap 209, a nut 264 being threaded upon its outer end. 'I'he spring 26|, bearing at its opposite ends against the ilange 263 on rod 26| and the block 264 at the outer end of bar 209, serves to draw the said bar and head 2|0 outwardly so as to yieldably maintain the guide roller 232 in engagement with the template.

Stop means for template cutting unit As brought out above, when the motor 260 is placed in operation, the cutting unit 24 will be driven around the track template 23, with the cutting wheel 25 scoring the glass sheet 22 along the line 26 in Fig. 1. It is preferred that the cutting unit be positively driven through only a portion of its cutting cycle and then permitted to coast the balance of its cycle. In order to reduce the shock of sudden stopping and the tendency of the cutting unit to rebound, the invention contemplates the provision of means for first reducing the speed of the cutting unit as it approaches the end of its cutting movement and then bringing the'same to a stop and maintaining it in such position until it is desired to repeat the cutting operation.

The cutting unit stop means is best illustrated in Figs. 1, 5, 10 and 11 and comprises a horizontal plate 265 arranged at the front of the cutting table intermediate the ends thereof and secured to the longitudinally extending strip |69 by bolts or the like 266 and spaced therefrom by collars 261 through which said bolts pass. Carried by the plate 265 is a pair of opposed levers 260 and 269 pivoted thereto as at 210 and 21| respectively. Carried at the free ends of the levers 260 and 269 are depending pins 212 and 213 respectively which pass through slots 214 and 215 in the plate 265 and are connected by a tension spring 216 which functions to normally draw the levers 266 and 269 together.

Carried by and depending from the housing 206 of the cutting unit 24 is a stop pin 211 and as the cutting unit approaches the end of its cutting cycle or stroke, the stop pin passes between the levers 260 and 269 as indicated by the broken lines in Fig. 10, whereupon the frictional en 265. The stop bar 218 is normally maintained in the path of travel of the stop pin 211 by a spring 280 fastened at one end to a post 28| on the block 219 and at its opposite end to a post 282 carried by stop bar 218. The inward movement of the stop bar is limited by a screw 283 threaded in block 219 and engageable by the post 282. By proper adjustment of the screw 283, the inward movement of the stop bar can be accurately regulated. The spring 280 serves to normally maintain the stop bar 218 in the position indicated in Fig. 10, so that after the pin 211 on the cutting unit passes from between the levers 268 and 269, it will engage the inner end 284 of said bar as shown by the full lines in Fig. 10 and bring the slowly moving cutting unit to a stop. The levers 268 and 269 are provided at their outer free ends with substantially semi-circular notches 285 and 286 in which the stop pin 211 is received when the cutting unit is brought to a stop and by means of which rebound of the cutting unit is prevented.

It will be evident from the above that the stop bar 218 will not only act to bring the cutting unit to a stop but will also prevent further movement of the unit until the said bar is moved out of the path of travel of the stop pin 211. This is adapted to be automatically accomplished at the proper time in the operation of the machine by a solenoid 281 (Fig. 1l) carried by a frame 288 supported by an angle bracket 289 secured to the channel beam 36. Also secured to the channel beam 36 is a bracket 290 to which is pivoted as at 29| a bell-crank lever 292 comprising a substantially vertical leg 293 and a substantially horizontal leg 294, said horizontal leg having pivoted at its outer end as at 295 a vertical link 296 pivotally connected at its lower end .at 291 to the vertically movable plunger 298 of the solenoid 281. rihe vertical leg 293 of bell-crank lever 292 is adapted to engage a hooked portion 29S formed at the outer end of the stop bar 218. When the solenoid 281 is energized, the plunger 298 thereof will be drawn downwardly to rock the bell-crank lever V292 in a counter-clockwise direction about its pivot 29| whereupon the vertical leg 293 of said lever, engaging the hooked portion 299 of stop bar 218, will draw the said bar out of engagement with the stop pin 211 on the 'cutting unit, thereby permitting movement of the unit around the template 23. Upon de-energization of the solenoid 281, the tension of the spring 280 will be sufiicient to again move the stop bar inwardly so that it will be in position to stop the-cutting unit upon the completion of its cutting stroke.

Cross cutin-g unit The cross cutting unit 21 is best illustrated in Figs. 1, 2, 3, 5 and 6. This unit is preferably supported beneath and carried by the table top 2| and is adapted to cut in half the form or section cut out of the glass sheet by the template cutting unit 24. For instance, when cutting half Windshields, the cutting wheel 25 of cutting unit 24 serves to score the glass sheet through a continuous closed path forming the outline or" the 'complete windshield, while the cutting wheel 28 of cutting unit 21 serves to score the sheet transversely along a straight path which intersects the closed path of the cutting wheel 25 at opposed points and cuts the complete windshield in half to form two similar half windshields. In mounting the cross cutting unit, the table top 2| is provided intermediate its ends with a transverse opening or slot son and secured to the underside of the table, at opposite sides of said opening, are spaced rails 30| and 302 along which the cutting unit 21 is adapted to travel, said rails being secured to the table by screws 303. The cutting unit 21 comprises a housing 304 provided at one side with a pair of spaced wheels 305 riding upon the top of rail 30| and a pair of similar wheels 306 engaging the bottom of said rail, said wheels being preferably received within grooves or channels in the rail to prevent lateral movement of the cutting unit. Carried at the opposite side of the housing is a pair of wheels 301 engaging the upper surface of rail 302.

The cutter housing 304 is provided with a vertical bore 308 in which is slidably received a cutter holder 309 carrying the cutting wheel 28 at its upper end. The bore 308 is enlarged at its lower end as at 3|0 and has threaded therein a nut 3| The cutter holder 304 is provided with a downwardly opening recess 3|2 and arranged therein is a. compression spring 3|3 bearing at its upper end against the holder 309 and at its lower end against nut 3| I, said spring serving to normally urge the holder upwardly to maintain the cutting Wheel 28 in yieldable engagement with the bottom surface of the glass sheet. For the purpose of limiting the upward movement of the cutting wheel, there is inserted transversely through the holder 309 a horizontal pin 3|4, the projecting ends of which are received in slots 3|5 in the housing 304 and engage screws 3|6 carried at the upper end of said housing. From the above, it will be apparent that upon raising or lowering of the table top 2|, the cross cutting unit 21 will be raised and lowered therewith.

The cross cutting unit 21 is adapted to be positively driven along the rails 30| and 302, and this may be effected by drive means, best illustrated in Figs. 2, 3, 5 and 14, said means including a sprocket chain 3|6 connected to the opposite ends of the cutting unit 21 (Fig. 5), with the chain being trained about a sprocket wheel 3|1 at the front of the cutting table, a sprocket wheel 3|8 at the rear of said table, and a sprocket wheel 3|9 beneath the table (Fig. 3). The sprocket wheels 3 1, 318 are suitably carried by the channel beams 36 and 31 respectively while the sprocket wheel 3|9 is loosely mounted upon a shaft 320 constituting a part of a gear reduction mechanism located in the housing 32| and driven from a reversible motor 322 through a sprocket and chain drive or the like 323. The gear reduction housing 32| is hung from a bracket 324 carried by the angle beam 68.

rlhe sprocket wheel 3|9 constitutes part of a riction clutch 325, the construction of which is best illustrated in Fig. 14. The clutch also includes a metal disc 326 keyed to the shaft 320 and having on its inner face a friction disc 321. The sprocket wheel 3|9 is normally maintained in irictional engagement with the disc 321 by a compression spring 328 encircling the shaft 320 and held thereon by a nut 329. The reversible motor 322 is adapted to be in continuous operation, driving the shaft 320 and disc 326 nrst in one direction and then the other. Upon rotation or' the shaft 320, the sprocket wheel 3|9 will also be driven due to its frictional engagement with the disc 321, thereby causing the cutting unit to travel rst in one direction and then the other transversely of the cutting table. The cross cutting unit is adapted to travel in alternate directions across successive sheets to be cut. That is to say, the cutting unit does not travel across the table rst in one direction and then the other during the cutting of each sheet of glass, but instead travels in one direction during the cutting of one sheet and then in the opposite direction upon cutting of the next sheet. When the cutting unit reaches the end of its cutting stroke in either direction, it is adapted to engage a stop member 335 (Fig. 5) carried by the table. While this member will bring the cutting unit to a stop, the motor 322 will continue to operate, during which time the disc 321 will be permitted to turn or slip relative to the sprocket wheel 3|3. When it is desired to cut another sheet, the motor is reversed whereupon the sprocket wheel 3I3 will again be driven to move the cutting unit in the opposite direction.

sheet guiding and positioning means 'Ihis invention also comprehends the provision of novel means for automatically effecting the accurate positioning of the glass sheet 22 upon the cutting table as it is delivered thereon from the approach conveyor 35. As shown in Fig. l, the table top 2| is provided along one side thereof with a plurality of sheet edge engaging guide rollers 33| mounted in fixed horizontal alignment with one another and freely rotatable upon pins 332, while arranged along the opposite side of the table is a plurality of aligned guide rollers 333 which engage the opposite edge of the sheet and are spring-pressed into engagement therewith. Thus, each roller 333 is mounted to freely rotate upon a pin 334 carried at one end of a bell-crank lever 335, said lever being pivoted intermediate its ends at 335 to a plate 331 secured to the table by screws 338 passing through slots 333. Fastened to the opposite end of the bell-crank lever 335 is a tension spring 345 which serves to normally urge the roller 333 inwardly into engagement with the edge of the sheet. With this arrangement, as the glass sheet is received between the rollers 33| and 333, the rollers 333 will act to hold the sheet in engagement with the rollers 33| and thereby maintain the sheet in proper position. There is also provided at the forward end of the cutting table means, designated generally by the numeral 34|, for Hunting the forward movement of the glass sheet upon said table and for bringing the said sheet to a stop when it reaches the desired predetermined position thereon, while means, designated generally by the numeral 342, is arranged at the opposite end of the cutting table for preventing undue rebound of the sheet when it engages the stop means 34|.

'I'he stop means 34| comprises ahorizontal strip 343 slidable through a block 344 and provided at its inner end with a plate 345 engageable by the forward edge of the glass sheet. The block 344 is mounted upon a transverse bar 345 having cylindrical end portions passing through horizontal bearings 341 and 343 carried by arms 343 and 355 provided at their inner ends with vertical bearings 35| and 352 mounted upon vertical pins 353 and 354 respectively carried by the table top. 'I'he bar 345 is mounted for rocking movement and upon turning of the bar in a clockwise direction (Fig. l), the inner end of the strip 343 and plate 345 will be lifted upwardly out of engagement with the glass sheet as shown by the broken lines in Fig. 13, thereby permitting the sheet to pass oil.' the table. However, when the plate 345 is in lowered position as shown by the full lines in Fig. 13, it is disposed in the path of travel of the glass sheet. The said stop plate is in this position when the glass sheet is fed onto the cutting table and upon engagement of the forward edge of the sheet with the plate, the said sheet will be brought to a stop. The plate 345 is normally urged inwardly by a spring 355 fastened at one end to the block 355 and at its opposite end to a post 355 on strip 343.

The means for lifting the stop plate 345 out of the path of travel of the glass sheet subsequent to the cutting operationv to permit the removal of said sheet from the cutting table includes a solenoid 351 carried by a frame 358 suspended from the supporting framework by hangers 353. Secured to one end of the bar 345 is a depending link 355 and fastened to the lower end of said link is one end of a sprocket chain 35|, said chain passing over a sprocket wheel 352 and being connected at its opposite end to the vertically movable plunger 353 of solenoid 351. When the solenoid is energized, the plunger 353 thereof will be drawn downwardly, thereby swinging the link 355 to the right (Fig. 13) to rock the bar 345 in a counter-clockwise direction to eifect the raising of the stop plate 345 out of engagement with the sheet. Upon de-energization of the solenoid, the said stop plate will be automatically lowered to sheet engaging position by the downward pressure of springs 354 engaging ears 355 fixed to the bar 345. It is preferred, in the operation of the machine, that the stop plate 345 be only momentarily raised at the completion of the cutting operation to permit the forward edge of the sheet to pass therebeneath, after which the said plate is lowered to rest upon the glass. In order to facilitate the passage of the sheet from the cutting table, relatively small rollers 355 can be carried by the strip 343 to ride along upon the upper surface of the glass sheet as the said sheet is delivf ered from the table.

When the forward edge of the glass sheet engages the stop plate 345, the sheet will move the strip 343 slightly outwardly against the action of the spring 355. 'I'he sheet will, however, be brought to a stop when the compression of the spring overcomes theforce of the sheet. When this occurs, there may be a slight rebound of the sheet and the stop means 342 is provided to prevent or limit this rebound. 'I'he stop means 342 is similar to stop means 34| and also includes a strip 351 passing horizontally through a block 353 and secured thereto by a set screw 353. The block 355 is mounted upon a transverse bar 315 having cylindrical end portions which are received in horizontal bearings 31| and 312 having formed integral therewith horizontal arms 313 and 314 provided at their opposite ends with vertical bearings 315 and 315 mounted on pins 311 and 315 carried by the table top 2|. The strip 351 is provided at its inner endwith a stop plate 313 and also with the sheet engaging rollers 355. As the glass sheet is fed onto the cutting table from the approach conveyor 35, the said sheet initially engages the rollers 355, causing the plate 313 to be lifted upwardly, whereby to permit the movement of the sheet onto the cutting table, and during the passage of the sheet onto said table, the rollers 355 ride along upon the upper surface of said sheet. As soon as the rear edge of the sheet passes beyond the stop plate 313, the said plate falls downwardly to prevent or limit rearward movement of the glass sheet when it engages the stop means 34| at the forward end of the table. It will thus be clearly seen that means is provided for accurately positioning the glass sheet upon the cutting table automatically and without any assistance from the operator. In order to prevent slippage of the sheet upon the table top during cutting, a plurality of preferably spring fingers 38| are carried by the metal side strips |89 and |90 and are adapted to engage the upper surface of the sheet upon the raising of the table top. The ngers 38| are secured to the side strips |89 and |90 by screws or bolts 382 passing through slots 383 in said fingers.

Control drum The operation of the various parts of the machine is controlled by a common control means in the form of a rotatable drum 384, and upon reference particularly to Figs. 15 to 18 inclusive, it will be seen that the control drum is provided circumferentially thereof with a plurality of spaced contact strips 385 to 390 inclusive, said strips being of different lengths so that they extend different distances around the drum. Extending longitudinally of the drum is a rod 39| and loosely mounted upon this rod are the six substantially L-shaped contact levers 392 to 391 inclusive which cooperate respectively with the six contact strips 385 to 390. The contact levers 392 to 391 are provided at their upper inner ends with rollers 398 to 403 inclusive adapted to engage the contact strips 385 to 390 respectively, while the lower outer ends of said levers cooperate with stationary contacts to provide switches '404 to 409 respectively. When the rollers 398 to 403 are in engagement with the respective contact strips 385 to 390, the switches 404 to 409 are closed, whereas when the said rollers pass out of engagement with the contact strips, the switches are automatically opened by rocking of the levers 392 to 391 upon the rod 39|. Thus, it will be seen that the length of time each switch 404 to 409 is caused to remain closed during each rotation of the drum 384 depends upon the length of 'the respective contact strip 385 to 390.

The drum 384 is loosely mounted upon a horizontal shaft M0 journaled at its opposite ends in bearings 41| and 4|2 and positively driven at all times from a suitable source of power through a chain and sprocket drive or the like 4|3. The drum 384 is connected with and driven from the shaft 4i0 through a friction clutch designated in its entirety by the numeral 4|4.v This clutch comprises a metal disc 4|5 keyed to the shaft 4|@ and having on its inner face a friction disc 4|G. Carried by the drum 384 is a metal disc 4H yieldably maintained in engagement with the friction disc 4l6 by a plurality of springs 4 I8. Ordinarily, the disc 4|'l will be held against disc 4|6 with sufficient pressure to cause the drum 384 to be driven 'from the shaft 4|0. On the other hand, however, the rotation of the drum can be stopped while the shaft continues to rotate, at which time 'the discs 4|8 and 4H will slip relative to one another. The purpose of this construction will be more clearly hereinafter apparent.

According to the invention, the drum 384 is adapted to rota-te one complete revolution during each cutting cycle. The drum, however, does not rotate continuously but instead is driven onehalf a revolution and then momentarily brought to a stop, after which it is again rotated onehalf a revolution and stopped. lThe means for controlling the rotation of the drum is best illustrated in Fig. i6. As here shown, the drum is provided at one end thereof and at diametrically opposite points with two lugs 4|9 and 420, and cooperating with these lugs is a stop member 42| carried at the outer end of a. bell-crank lever 422 pivoted intermediate its ends as at 423 to a bracket @24 mounted upon a platform 425. Suspended beneath the platform by hangers 426 is a frame 421 carrying a solenoid 428, the vertically movable plunger 429 of which has pivotally connected thereto a vertical link 430 pivoted at its upper end as at 43| to the outer end of the bell-crank lever 422.

The bell-crank lever 422 is normally urged in a counter-clockwise direction by means of a spring 432 to maintain the stop member 42| in the path of travel of the lugs 4I9 and 420. However, upon energization of the solenoid 428, the bell-crank lever Will be rocked in a clockwise direction against the action of the spring 432 whereupon the stop member 42| will be Withdrawn from the path of travel of the lugs 4| 9 and 420, permitting the drum to rotate. As indicated by the full lines in Fig. 16, the stop member 42| is engaged by the lug 4|9, thereby preventing rotation of the drum 384 and at this time the solenoid 428 is deenergized. However, when the solenoid 428 ls energized, the stop member 42| will be moved to the broken line position out of engagement with lug 4|9, whereupon the drum will be permitted to again rotate. After the lug 4|9 has passed beyond the stop member 42|, the solenoid is adapted to bev again de-energized to return the stop member to full line position where it will be engaged by the lug 420 when the drum has completed one-half a revolution. When the lug 420 engages stop member 42 I, the drum will again be brought to a stop and will remain stationary until the solenoid 428 is again energized. The drum may therefore be said to rotate intermittently one-half a complete revolution and the advantage of driving the drum in this manner will be more clearly hereinafter apparent.

Operation and electrical wiring of machine In the operation of the machine, the glass sheet '22 to be cutis first placed upon the approach run- .A

way 30 and delivered thereby onto the cutting table. When the glass sheet is delivered onto the cutting table, the table top 23 is in lowered position as shown in Fig. 2 so that the sheet is received and supported upon the rollers 89 to 94. As soon as the sheet engages the driven roller 9|, the said roller will then serve to carry the sheet forwardly until the forward edge thereof engages the stop plate 345 of the sheet stop means 34| which, as brought out above, limits the forward movement of the sheet upon the table. When the sheet engages the stop means 34|, the strip 343 thereof will be forced outwardly against the raction of the spring 355 to cause the solenoid 428 (Fig. i6) to be energized to remove the stop member 42| from the path of travel of the lug il!) and permit the rotation of the control drum. To this end, there are provided the two contacts 433 and 434 carried by the strip 343 and block 344 respectively, the contact 433 being connected by a wire 435 (Fig. i7) to the positive main line 436, while leading from the contact 434 is a wire 43T connected to a wire 438 running to the solenoid 428 and leading from the said solenoid is a wire 439 connected with the negative main line 440. it will thus be seen that when the forward edge of the sheet engages strip 343, moving it against the action of spring 355, the contacts 433 and 434 will be engaged with one another and that during this time a circuit will be completed through the solenoid 428 to effect the energization thereof. Further, that upon energization of the solenoid, the stop member 42| will be moved out of engagement with lug 4|9 permitting the rotation of the control drum. The

circuit through the solenoid 428 will he only momentarily completed since the spring 355, upon lbeing compressed, will again torce the strip lnwardly to move the contact 848 away from contact 844.

When the control drum 384 is in the position shown in Fig. 16, none oi the rollers 888 to 483 carried by the contact levers 382 to 381 are in engagement with the contact strips 388 to 388 as will be clearly seen in Fig. 18, so that all of the switches 404 to 409 are open. However, when the drum is started to rotate, the various contact strips will be brought into engagement with the rollers on the contact levers to eiiect the operation of the different parts of the machine in the proper sequence. As brought out above. the drum is not permitted to rotate until the sheet is properly positioned upon the cutting table. When the sheet is, however, properly positioned and the drum starts to rotate in the direction indicated by the arrow in Fig. 18, the roller 398 on contact lever 392engaging contact strip 385 will eiect the closing of the .switch 404 and complete the circuit through the table raising solenoids 60 and 6| and upon energization of these solenoids, the table top 2| will be moved to elevated position to transfer the weight of the glass sheet from the supporting rollers to the table top. Upon closing of the switch 404, the current enters from the positive main line 44| through a wire 442 and passes through the switch 404 and wire 443 to the solenoid 6| and thence to the negative main line 444 through wire 445. A part of the current will also pass from the wire 443 through solenoid 60 and thence outwardly through wire 446 to the negative main line.

Substantially simultaneously with the raising of the table top, the template cutter stop solenoid 281 is adapted to be energized to draw the stop bar 218 out of engagement with the stop pin 211 to permit movement of the template cutting unit 24. 'I'his is accomplished when the roller 399 on contact lever 393 engages the contact strip 386 to close switch 405 whereupon electric current entering through wire 441 will pass through the switch 405 and wire 448 to the template cutter stop solenoid 281 and thence outwardly through wire 449. Just as soon as the cutting table is moved to elevated position, the-template cutter motor 260 will be placed in operation to drive the template cutting unit around the track template `23. The motor 260 is placed in operation just as soon as the roller 400 on contact lever 394 engages the contact strip 381 to efi'ect the closing of the switch 406 whereupon the current entering through line 450 will pass through said switch 406 and thence through the wire 45| to motor 260 and out through wire 452 to the negative main line.

After the glass sheet has been delivered from the approach conveyor 30 onto the cutting table, the operation of said approach conveyor is discontinued and the stopping of the conveyor is eil'ected when the solenoid |13 is energized (Fig.

8) to disengage the discs |59 and |60 of the friction clutch |56. When the solenoid |13 is energized, the current entering through wire 453 passes through switch 401 and wire 454 to the solenoid |13 and from said solenoid through a wire 455 to the negative main line.

When the template cutting unit 24 reaches approximately the point a (Fig. l) in its travel around the template, the cross cutter motor 322 will be placed in operation due to the fact that at this time the roller 402 on contact levell 386 engages the contact strip 888 to eil'ect the closing oi switch 488. The current entering through line 458 passes through switch 488, wire 481, and reversible switch 458 to the reversible motor 322, and thence from the motor through wire 458 leading to the negative main line. Upon operation of the motor 322, the sprocket chain 3|6 will be driven to move the cutting unit 21 along the rails 30| and 802, and the movement of the cutting unit is continued until said unit engages stop 388 (Fig. 5) which prevents further movement oi' the cutting unit. Although the cutting unit is rought to a stop, the motor 322 may continue to operate for a relatively longer period of time due to the provision of the friction clutch 325.

When the template cutting unit 24 reaches approximately the point a, the control drum 384 has completed one-half a revolution, so that the lug 420 thereon engaging stop member 42| will bring said drum temporarily to a stop. However, the shaft 4|0 will continue to rotate due to the provision of the friction clutch 4|4. Likewise, the template cutting unit 24 will still be driven as the switch 406 is still closed. Upon continued movement of the template cutting unit, the stop pin 211 thereon engages an arm 460 (Figs. l and 17) pivoted at one end as at 46| to a horizontal plate 462. Carried by the plate 462 is a stationary contact 463, while carried by the arm 460 is a spring contact 464, the contacts 463 and 464 being normally held apart by a tension spring 465, with the outward movement of said arm 460 being controlled by a pin 466 carried by plate 462 and operating in a slot 461 in said arm. When the guide pin 211 on the cutting unit engages the arm 460, the said arm is moved inwardly aboutv its pivot to bring the contacts 463 and 464 into engagement with one another whereby to again close the circuit through the solenoid 428 (Fig. 16) at which time the current enters wire 468 and, after passing through contacts 463 and 464, flows through wire 438 to the solenoid 428 and thence out through wire 439 to the negative main line 440. 'I'he closing of this circuit will again cause the energization of the solenoid 428 to move the stop member 42| away from lug 428, thereby permitting the drum to again rotate. When the template cutting unit passes beyond the arm 460, the spring 465 will move the contacts 463 and 464 apart to break the circuit through the solenoid 428 so that the spring 432 can act to move the stop member 42| into the path of travel of the lug 4|9.

When the template cutting unit 24 reaches approximately the point b (Fig. 1), the positive drive therefor will be discontinued so that the cutting unit will be permitted to coast the remainder of its cycle or stroke. In other words, when the cutting unit reaches point b, the rollei 400 on contact lever 394 will pass out of engagement with the contact strip 381 to open the switch 406 and break the circuit through the motor 260. As the cutting unit reaches the end of its cutting .stroke, the speed of travel thereof will first be slowed down by frictional contact of the stop pin 211 with the levers 268 and 269 of the cutter stop mechanism, after which the said unit will be brought to a stop by engagement of said pin 211 with the stop bar 218, said bar having been previously returned to operative position when the rotation of the control drum moved the contact strip 386 out of engagement with the roller 399 on contact lever 393 to open switch 405 and break the circuit through solenoid 281. The operation of the cross cutter motor 322 is discontinued when 

